In that case, can you remember what was the first thing you regretted when that person left? That's probably one of the most important, if not the most.
...Yeah, it's the sort of thing that's definitely important. But if you spent a lot of time together, having fun and enjoying life... Even if you never spoke the words, he must have known.
Maybe you can use your time apart as an opportunity to prepare yourself for the day you'll have the chance to tell him. It'd be... productive, in a way?
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